Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2257 insertions, 0 deletions

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
new file mode 100644
index 000000000..6abd1dce1
--- /dev/null
+++ b/tools/perf/util/symbol.c
@@ -0,0 +1,2257 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <dirent.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <linux/kernel.h>
+#include <linux/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include "annotate.h"
+#include "build-id.h"
+#include "util.h"
+#include "debug.h"
+#include "machine.h"
+#include "symbol.h"
+#include "strlist.h"
+#include "intlist.h"
+#include "namespaces.h"
+#include "header.h"
+#include "path.h"
+#include "sane_ctype.h"
+
+#include <elf.h>
+#include <limits.h>
+#include <symbol/kallsyms.h>
+#include <sys/utsname.h>
+
+static int dso__load_kernel_sym(struct dso *dso, struct map *map);
+static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
+static bool symbol__is_idle(const char *name);
+
+int vmlinux_path__nr_entries;
+char **vmlinux_path;
+
+struct symbol_conf symbol_conf = {
+	.use_modules		= true,
+	.try_vmlinux_path	= true,
+	.demangle		= true,
+	.demangle_kernel	= false,
+	.cumulate_callchain	= true,
+	.show_hist_headers	= true,
+	.symfs			= "",
+	.event_group		= true,
+	.inline_name		= true,
+};
+
+static enum dso_binary_type binary_type_symtab[] = {
+	DSO_BINARY_TYPE__KALLSYMS,
+	DSO_BINARY_TYPE__GUEST_KALLSYMS,
+	DSO_BINARY_TYPE__JAVA_JIT,
+	DSO_BINARY_TYPE__DEBUGLINK,
+	DSO_BINARY_TYPE__BUILD_ID_CACHE,
+	DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
+	DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
+	DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
+	DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
+	DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
+	DSO_BINARY_TYPE__GUEST_KMODULE,
+	DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
+	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
+	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
+	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
+	DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
+	DSO_BINARY_TYPE__NOT_FOUND,
+};
+
+#define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
+
+static bool symbol_type__filter(char symbol_type)
+{
+	symbol_type = toupper(symbol_type);
+	return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
+}
+
+static int prefix_underscores_count(const char *str)
+{
+	const char *tail = str;
+
+	while (*tail == '_')
+		tail++;
+
+	return tail - str;
+}
+
+void __weak arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
+{
+	p->end = c->start;
+}
+
+const char * __weak arch__normalize_symbol_name(const char *name)
+{
+	return name;
+}
+
+int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
+{
+	return strcmp(namea, nameb);
+}
+
+int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
+					unsigned int n)
+{
+	return strncmp(namea, nameb, n);
+}
+
+int __weak arch__choose_best_symbol(struct symbol *syma,
+				    struct symbol *symb __maybe_unused)
+{
+	/* Avoid "SyS" kernel syscall aliases */
+	if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
+		return SYMBOL_B;
+	if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
+		return SYMBOL_B;
+
+	return SYMBOL_A;
+}
+
+static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
+{
+	s64 a;
+	s64 b;
+	size_t na, nb;
+
+	/* Prefer a symbol with non zero length */
+	a = syma->end - syma->start;
+	b = symb->end - symb->start;
+	if ((b == 0) && (a > 0))
+		return SYMBOL_A;
+	else if ((a == 0) && (b > 0))
+		return SYMBOL_B;
+
+	/* Prefer a non weak symbol over a weak one */
+	a = syma->binding == STB_WEAK;
+	b = symb->binding == STB_WEAK;
+	if (b && !a)
+		return SYMBOL_A;
+	if (a && !b)
+		return SYMBOL_B;
+
+	/* Prefer a global symbol over a non global one */
+	a = syma->binding == STB_GLOBAL;
+	b = symb->binding == STB_GLOBAL;
+	if (a && !b)
+		return SYMBOL_A;
+	if (b && !a)
+		return SYMBOL_B;
+
+	/* Prefer a symbol with less underscores */
+	a = prefix_underscores_count(syma->name);
+	b = prefix_underscores_count(symb->name);
+	if (b > a)
+		return SYMBOL_A;
+	else if (a > b)
+		return SYMBOL_B;
+
+	/* Choose the symbol with the longest name */
+	na = strlen(syma->name);
+	nb = strlen(symb->name);
+	if (na > nb)
+		return SYMBOL_A;
+	else if (na < nb)
+		return SYMBOL_B;
+
+	return arch__choose_best_symbol(syma, symb);
+}
+
+void symbols__fixup_duplicate(struct rb_root *symbols)
+{
+	struct rb_node *nd;
+	struct symbol *curr, *next;
+
+	if (symbol_conf.allow_aliases)
+		return;
+
+	nd = rb_first(symbols);
+
+	while (nd) {
+		curr = rb_entry(nd, struct symbol, rb_node);
+again:
+		nd = rb_next(&curr->rb_node);
+		next = rb_entry(nd, struct symbol, rb_node);
+
+		if (!nd)
+			break;
+
+		if (curr->start != next->start)
+			continue;
+
+		if (choose_best_symbol(curr, next) == SYMBOL_A) {
+			rb_erase(&next->rb_node, symbols);
+			symbol__delete(next);
+			goto again;
+		} else {
+			nd = rb_next(&curr->rb_node);
+			rb_erase(&curr->rb_node, symbols);
+			symbol__delete(curr);
+		}
+	}
+}
+
+void symbols__fixup_end(struct rb_root *symbols)
+{
+	struct rb_node *nd, *prevnd = rb_first(symbols);
+	struct symbol *curr, *prev;
+
+	if (prevnd == NULL)
+		return;
+
+	curr = rb_entry(prevnd, struct symbol, rb_node);
+
+	for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
+		prev = curr;
+		curr = rb_entry(nd, struct symbol, rb_node);
+
+		if (prev->end == prev->start || prev->end != curr->start)
+			arch__symbols__fixup_end(prev, curr);
+	}
+
+	/* Last entry */
+	if (curr->end == curr->start)
+		curr->end = roundup(curr->start, 4096) + 4096;
+}
+
+void map_groups__fixup_end(struct map_groups *mg)
+{
+	struct maps *maps = &mg->maps;
+	struct map *next, *curr;
+
+	down_write(&maps->lock);
+
+	curr = maps__first(maps);
+	if (curr == NULL)
+		goto out_unlock;
+
+	for (next = map__next(curr); next; next = map__next(curr)) {
+		if (!curr->end)
+			curr->end = next->start;
+		curr = next;
+	}
+
+	/*
+	 * We still haven't the actual symbols, so guess the
+	 * last map final address.
+	 */
+	if (!curr->end)
+		curr->end = ~0ULL;
+
+out_unlock:
+	up_write(&maps->lock);
+}
+
+struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
+{
+	size_t namelen = strlen(name) + 1;
+	struct symbol *sym = calloc(1, (symbol_conf.priv_size +
+					sizeof(*sym) + namelen));
+	if (sym == NULL)
+		return NULL;
+
+	if (symbol_conf.priv_size) {
+		if (symbol_conf.init_annotation) {
+			struct annotation *notes = (void *)sym;
+			pthread_mutex_init(&notes->lock, NULL);
+		}
+		sym = ((void *)sym) + symbol_conf.priv_size;
+	}
+
+	sym->start   = start;
+	sym->end     = len ? start + len : start;
+	sym->type    = type;
+	sym->binding = binding;
+	sym->namelen = namelen - 1;
+
+	pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
+		  __func__, name, start, sym->end);
+	memcpy(sym->name, name, namelen);
+
+	return sym;
+}
+
+void symbol__delete(struct symbol *sym)
+{
+	free(((void *)sym) - symbol_conf.priv_size);
+}
+
+void symbols__delete(struct rb_root *symbols)
+{
+	struct symbol *pos;
+	struct rb_node *next = rb_first(symbols);
+
+	while (next) {
+		pos = rb_entry(next, struct symbol, rb_node);
+		next = rb_next(&pos->rb_node);
+		rb_erase(&pos->rb_node, symbols);
+		symbol__delete(pos);
+	}
+}
+
+void __symbols__insert(struct rb_root *symbols, struct symbol *sym, bool kernel)
+{
+	struct rb_node **p = &symbols->rb_node;
+	struct rb_node *parent = NULL;
+	const u64 ip = sym->start;
+	struct symbol *s;
+
+	if (kernel) {
+		const char *name = sym->name;
+		/*
+		 * ppc64 uses function descriptors and appends a '.' to the
+		 * start of every instruction address. Remove it.
+		 */
+		if (name[0] == '.')
+			name++;
+		sym->idle = symbol__is_idle(name);
+	}
+
+	while (*p != NULL) {
+		parent = *p;
+		s = rb_entry(parent, struct symbol, rb_node);
+		if (ip < s->start)
+			p = &(*p)->rb_left;
+		else
+			p = &(*p)->rb_right;
+	}
+	rb_link_node(&sym->rb_node, parent, p);
+	rb_insert_color(&sym->rb_node, symbols);
+}
+
+void symbols__insert(struct rb_root *symbols, struct symbol *sym)
+{
+	__symbols__insert(symbols, sym, false);
+}
+
+static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
+{
+	struct rb_node *n;
+
+	if (symbols == NULL)
+		return NULL;
+
+	n = symbols->rb_node;
+
+	while (n) {
+		struct symbol *s = rb_entry(n, struct symbol, rb_node);
+
+		if (ip < s->start)
+			n = n->rb_left;
+		else if (ip > s->end || (ip == s->end && ip != s->start))
+			n = n->rb_right;
+		else
+			return s;
+	}
+
+	return NULL;
+}
+
+static struct symbol *symbols__first(struct rb_root *symbols)
+{
+	struct rb_node *n = rb_first(symbols);
+
+	if (n)
+		return rb_entry(n, struct symbol, rb_node);
+
+	return NULL;
+}
+
+static struct symbol *symbols__last(struct rb_root *symbols)
+{
+	struct rb_node *n = rb_last(symbols);
+
+	if (n)
+		return rb_entry(n, struct symbol, rb_node);
+
+	return NULL;
+}
+
+static struct symbol *symbols__next(struct symbol *sym)
+{
+	struct rb_node *n = rb_next(&sym->rb_node);
+
+	if (n)
+		return rb_entry(n, struct symbol, rb_node);
+
+	return NULL;
+}
+
+static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
+{
+	struct rb_node **p = &symbols->rb_node;
+	struct rb_node *parent = NULL;
+	struct symbol_name_rb_node *symn, *s;
+
+	symn = container_of(sym, struct symbol_name_rb_node, sym);
+
+	while (*p != NULL) {
+		parent = *p;
+		s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
+		if (strcmp(sym->name, s->sym.name) < 0)
+			p = &(*p)->rb_left;
+		else
+			p = &(*p)->rb_right;
+	}
+	rb_link_node(&symn->rb_node, parent, p);
+	rb_insert_color(&symn->rb_node, symbols);
+}
+
+static void symbols__sort_by_name(struct rb_root *symbols,
+				  struct rb_root *source)
+{
+	struct rb_node *nd;
+
+	for (nd = rb_first(source); nd; nd = rb_next(nd)) {
+		struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
+		symbols__insert_by_name(symbols, pos);
+	}
+}
+
+int symbol__match_symbol_name(const char *name, const char *str,
+			      enum symbol_tag_include includes)
+{
+	const char *versioning;
+
+	if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
+	    (versioning = strstr(name, "@@"))) {
+		int len = strlen(str);
+
+		if (len < versioning - name)
+			len = versioning - name;
+
+		return arch__compare_symbol_names_n(name, str, len);
+	} else
+		return arch__compare_symbol_names(name, str);
+}
+
+static struct symbol *symbols__find_by_name(struct rb_root *symbols,
+					    const char *name,
+					    enum symbol_tag_include includes)
+{
+	struct rb_node *n;
+	struct symbol_name_rb_node *s = NULL;
+
+	if (symbols == NULL)
+		return NULL;
+
+	n = symbols->rb_node;
+
+	while (n) {
+		int cmp;
+
+		s = rb_entry(n, struct symbol_name_rb_node, rb_node);
+		cmp = symbol__match_symbol_name(s->sym.name, name, includes);
+
+		if (cmp > 0)
+			n = n->rb_left;
+		else if (cmp < 0)
+			n = n->rb_right;
+		else
+			break;
+	}
+
+	if (n == NULL)
+		return NULL;
+
+	if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
+		/* return first symbol that has same name (if any) */
+		for (n = rb_prev(n); n; n = rb_prev(n)) {
+			struct symbol_name_rb_node *tmp;
+
+			tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
+			if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
+				break;
+
+			s = tmp;
+		}
+
+	return &s->sym;
+}
+
+void dso__reset_find_symbol_cache(struct dso *dso)
+{
+	dso->last_find_result.addr   = 0;
+	dso->last_find_result.symbol = NULL;
+}
+
+void dso__insert_symbol(struct dso *dso, struct symbol *sym)
+{
+	__symbols__insert(&dso->symbols, sym, dso->kernel);
+
+	/* update the symbol cache if necessary */
+	if (dso->last_find_result.addr >= sym->start &&
+	    (dso->last_find_result.addr < sym->end ||
+	    sym->start == sym->end)) {
+		dso->last_find_result.symbol = sym;
+	}
+}
+
+struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
+{
+	if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
+		dso->last_find_result.addr   = addr;
+		dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
+	}
+
+	return dso->last_find_result.symbol;
+}
+
+struct symbol *dso__first_symbol(struct dso *dso)
+{
+	return symbols__first(&dso->symbols);
+}
+
+struct symbol *dso__last_symbol(struct dso *dso)
+{
+	return symbols__last(&dso->symbols);
+}
+
+struct symbol *dso__next_symbol(struct symbol *sym)
+{
+	return symbols__next(sym);
+}
+
+struct symbol *symbol__next_by_name(struct symbol *sym)
+{
+	struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
+	struct rb_node *n = rb_next(&s->rb_node);
+
+	return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
+}
+
+ /*
+  * Returns first symbol that matched with @name.
+  */
+struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
+{
+	struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
+						 SYMBOL_TAG_INCLUDE__NONE);
+	if (!s)
+		s = symbols__find_by_name(&dso->symbol_names, name,
+					  SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
+	return s;
+}
+
+void dso__sort_by_name(struct dso *dso)
+{
+	dso__set_sorted_by_name(dso);
+	return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
+}
+
+int modules__parse(const char *filename, void *arg,
+		   int (*process_module)(void *arg, const char *name,
+					 u64 start, u64 size))
+{
+	char *line = NULL;
+	size_t n;
+	FILE *file;
+	int err = 0;
+
+	file = fopen(filename, "r");
+	if (file == NULL)
+		return -1;
+
+	while (1) {
+		char name[PATH_MAX];
+		u64 start, size;
+		char *sep, *endptr;
+		ssize_t line_len;
+
+		line_len = getline(&line, &n, file);
+		if (line_len < 0) {
+			if (feof(file))
+				break;
+			err = -1;
+			goto out;
+		}
+
+		if (!line) {
+			err = -1;
+			goto out;
+		}
+
+		line[--line_len] = '\0'; /* \n */
+
+		sep = strrchr(line, 'x');
+		if (sep == NULL)
+			continue;
+
+		hex2u64(sep + 1, &start);
+
+		sep = strchr(line, ' ');
+		if (sep == NULL)
+			continue;
+
+		*sep = '\0';
+
+		scnprintf(name, sizeof(name), "[%s]", line);
+
+		size = strtoul(sep + 1, &endptr, 0);
+		if (*endptr != ' ' && *endptr != '\t')
+			continue;
+
+		err = process_module(arg, name, start, size);
+		if (err)
+			break;
+	}
+out:
+	free(line);
+	fclose(file);
+	return err;
+}
+
+/*
+ * These are symbols in the kernel image, so make sure that
+ * sym is from a kernel DSO.
+ */
+static bool symbol__is_idle(const char *name)
+{
+	const char * const idle_symbols[] = {
+		"cpu_idle",
+		"cpu_startup_entry",
+		"intel_idle",
+		"default_idle",
+		"native_safe_halt",
+		"enter_idle",
+		"exit_idle",
+		"mwait_idle",
+		"mwait_idle_with_hints",
+		"poll_idle",
+		"ppc64_runlatch_off",
+		"pseries_dedicated_idle_sleep",
+		NULL
+	};
+	int i;
+
+	for (i = 0; idle_symbols[i]; i++) {
+		if (!strcmp(idle_symbols[i], name))
+			return true;
+	}
+
+	return false;
+}
+
+static int map__process_kallsym_symbol(void *arg, const char *name,
+				       char type, u64 start)
+{
+	struct symbol *sym;
+	struct dso *dso = arg;
+	struct rb_root *root = &dso->symbols;
+
+	if (!symbol_type__filter(type))
+		return 0;
+
+	/*
+	 * module symbols are not sorted so we add all
+	 * symbols, setting length to 0, and rely on
+	 * symbols__fixup_end() to fix it up.
+	 */
+	sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
+	if (sym == NULL)
+		return -ENOMEM;
+	/*
+	 * We will pass the symbols to the filter later, in
+	 * map__split_kallsyms, when we have split the maps per module
+	 */
+	__symbols__insert(root, sym, !strchr(name, '['));
+
+	return 0;
+}
+
+/*
+ * Loads the function entries in /proc/kallsyms into kernel_map->dso,
+ * so that we can in the next step set the symbol ->end address and then
+ * call kernel_maps__split_kallsyms.
+ */
+static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
+{
+	return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
+}
+
+static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso)
+{
+	struct map *curr_map;
+	struct symbol *pos;
+	int count = 0;
+	struct rb_root old_root = dso->symbols;
+	struct rb_root *root = &dso->symbols;
+	struct rb_node *next = rb_first(root);
+
+	if (!kmaps)
+		return -1;
+
+	*root = RB_ROOT;
+
+	while (next) {
+		char *module;
+
+		pos = rb_entry(next, struct symbol, rb_node);
+		next = rb_next(&pos->rb_node);
+
+		rb_erase_init(&pos->rb_node, &old_root);
+
+		module = strchr(pos->name, '\t');
+		if (module)
+			*module = '\0';
+
+		curr_map = map_groups__find(kmaps, pos->start);
+
+		if (!curr_map) {
+			symbol__delete(pos);
+			continue;
+		}
+
+		pos->start -= curr_map->start - curr_map->pgoff;
+		if (pos->end > curr_map->end)
+			pos->end = curr_map->end;
+		if (pos->end)
+			pos->end -= curr_map->start - curr_map->pgoff;
+		symbols__insert(&curr_map->dso->symbols, pos);
+		++count;
+	}
+
+	/* Symbols have been adjusted */
+	dso->adjust_symbols = 1;
+
+	return count;
+}
+
+/*
+ * Split the symbols into maps, making sure there are no overlaps, i.e. the
+ * kernel range is broken in several maps, named [kernel].N, as we don't have
+ * the original ELF section names vmlinux have.
+ */
+static int map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta,
+				      struct map *initial_map)
+{
+	struct machine *machine;
+	struct map *curr_map = initial_map;
+	struct symbol *pos;
+	int count = 0, moved = 0;
+	struct rb_root *root = &dso->symbols;
+	struct rb_node *next = rb_first(root);
+	int kernel_range = 0;
+	bool x86_64;
+
+	if (!kmaps)
+		return -1;
+
+	machine = kmaps->machine;
+
+	x86_64 = machine__is(machine, "x86_64");
+
+	while (next) {
+		char *module;
+
+		pos = rb_entry(next, struct symbol, rb_node);
+		next = rb_next(&pos->rb_node);
+
+		module = strchr(pos->name, '\t');
+		if (module) {
+			if (!symbol_conf.use_modules)
+				goto discard_symbol;
+
+			*module++ = '\0';
+
+			if (strcmp(curr_map->dso->short_name, module)) {
+				if (curr_map != initial_map &&
+				    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
+				    machine__is_default_guest(machine)) {
+					/*
+					 * We assume all symbols of a module are
+					 * continuous in * kallsyms, so curr_map
+					 * points to a module and all its
+					 * symbols are in its kmap. Mark it as
+					 * loaded.
+					 */
+					dso__set_loaded(curr_map->dso);
+				}
+
+				curr_map = map_groups__find_by_name(kmaps, module);
+				if (curr_map == NULL) {
+					pr_debug("%s/proc/{kallsyms,modules} "
+					         "inconsistency while looking "
+						 "for \"%s\" module!\n",
+						 machine->root_dir, module);
+					curr_map = initial_map;
+					goto discard_symbol;
+				}
+
+				if (curr_map->dso->loaded &&
+				    !machine__is_default_guest(machine))
+					goto discard_symbol;
+			}
+			/*
+			 * So that we look just like we get from .ko files,
+			 * i.e. not prelinked, relative to initial_map->start.
+			 */
+			pos->start = curr_map->map_ip(curr_map, pos->start);
+			pos->end   = curr_map->map_ip(curr_map, pos->end);
+		} else if (x86_64 && is_entry_trampoline(pos->name)) {
+			/*
+			 * These symbols are not needed anymore since the
+			 * trampoline maps refer to the text section and it's
+			 * symbols instead. Avoid having to deal with
+			 * relocations, and the assumption that the first symbol
+			 * is the start of kernel text, by simply removing the
+			 * symbols at this point.
+			 */
+			goto discard_symbol;
+		} else if (curr_map != initial_map) {
+			char dso_name[PATH_MAX];
+			struct dso *ndso;
+
+			if (delta) {
+				/* Kernel was relocated at boot time */
+				pos->start -= delta;
+				pos->end -= delta;
+			}
+
+			if (count == 0) {
+				curr_map = initial_map;
+				goto add_symbol;
+			}
+
+			if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+				snprintf(dso_name, sizeof(dso_name),
+					"[guest.kernel].%d",
+					kernel_range++);
+			else
+				snprintf(dso_name, sizeof(dso_name),
+					"[kernel].%d",
+					kernel_range++);
+
+			ndso = dso__new(dso_name);
+			if (ndso == NULL)
+				return -1;
+
+			ndso->kernel = dso->kernel;
+
+			curr_map = map__new2(pos->start, ndso);
+			if (curr_map == NULL) {
+				dso__put(ndso);
+				return -1;
+			}
+
+			curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
+			map_groups__insert(kmaps, curr_map);
+			++kernel_range;
+		} else if (delta) {
+			/* Kernel was relocated at boot time */
+			pos->start -= delta;
+			pos->end -= delta;
+		}
+add_symbol:
+		if (curr_map != initial_map) {
+			rb_erase(&pos->rb_node, root);
+			symbols__insert(&curr_map->dso->symbols, pos);
+			++moved;
+		} else
+			++count;
+
+		continue;
+discard_symbol:
+		rb_erase(&pos->rb_node, root);
+		symbol__delete(pos);
+	}
+
+	if (curr_map != initial_map &&
+	    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
+	    machine__is_default_guest(kmaps->machine)) {
+		dso__set_loaded(curr_map->dso);
+	}
+
+	return count + moved;
+}
+
+bool symbol__restricted_filename(const char *filename,
+				 const char *restricted_filename)
+{
+	bool restricted = false;
+
+	if (symbol_conf.kptr_restrict) {
+		char *r = realpath(filename, NULL);
+
+		if (r != NULL) {
+			restricted = strcmp(r, restricted_filename) == 0;
+			free(r);
+			return restricted;
+		}
+	}
+
+	return restricted;
+}
+
+struct module_info {
+	struct rb_node rb_node;
+	char *name;
+	u64 start;
+};
+
+static void add_module(struct module_info *mi, struct rb_root *modules)
+{
+	struct rb_node **p = &modules->rb_node;
+	struct rb_node *parent = NULL;
+	struct module_info *m;
+
+	while (*p != NULL) {
+		parent = *p;
+		m = rb_entry(parent, struct module_info, rb_node);
+		if (strcmp(mi->name, m->name) < 0)
+			p = &(*p)->rb_left;
+		else
+			p = &(*p)->rb_right;
+	}
+	rb_link_node(&mi->rb_node, parent, p);
+	rb_insert_color(&mi->rb_node, modules);
+}
+
+static void delete_modules(struct rb_root *modules)
+{
+	struct module_info *mi;
+	struct rb_node *next = rb_first(modules);
+
+	while (next) {
+		mi = rb_entry(next, struct module_info, rb_node);
+		next = rb_next(&mi->rb_node);
+		rb_erase(&mi->rb_node, modules);
+		zfree(&mi->name);
+		free(mi);
+	}
+}
+
+static struct module_info *find_module(const char *name,
+				       struct rb_root *modules)
+{
+	struct rb_node *n = modules->rb_node;
+
+	while (n) {
+		struct module_info *m;
+		int cmp;
+
+		m = rb_entry(n, struct module_info, rb_node);
+		cmp = strcmp(name, m->name);
+		if (cmp < 0)
+			n = n->rb_left;
+		else if (cmp > 0)
+			n = n->rb_right;
+		else
+			return m;
+	}
+
+	return NULL;
+}
+
+static int __read_proc_modules(void *arg, const char *name, u64 start,
+			       u64 size __maybe_unused)
+{
+	struct rb_root *modules = arg;
+	struct module_info *mi;
+
+	mi = zalloc(sizeof(struct module_info));
+	if (!mi)
+		return -ENOMEM;
+
+	mi->name = strdup(name);
+	mi->start = start;
+
+	if (!mi->name) {
+		free(mi);
+		return -ENOMEM;
+	}
+
+	add_module(mi, modules);
+
+	return 0;
+}
+
+static int read_proc_modules(const char *filename, struct rb_root *modules)
+{
+	if (symbol__restricted_filename(filename, "/proc/modules"))
+		return -1;
+
+	if (modules__parse(filename, modules, __read_proc_modules)) {
+		delete_modules(modules);
+		return -1;
+	}
+
+	return 0;
+}
+
+int compare_proc_modules(const char *from, const char *to)
+{
+	struct rb_root from_modules = RB_ROOT;
+	struct rb_root to_modules = RB_ROOT;
+	struct rb_node *from_node, *to_node;
+	struct module_info *from_m, *to_m;
+	int ret = -1;
+
+	if (read_proc_modules(from, &from_modules))
+		return -1;
+
+	if (read_proc_modules(to, &to_modules))
+		goto out_delete_from;
+
+	from_node = rb_first(&from_modules);
+	to_node = rb_first(&to_modules);
+	while (from_node) {
+		if (!to_node)
+			break;
+
+		from_m = rb_entry(from_node, struct module_info, rb_node);
+		to_m = rb_entry(to_node, struct module_info, rb_node);
+
+		if (from_m->start != to_m->start ||
+		    strcmp(from_m->name, to_m->name))
+			break;
+
+		from_node = rb_next(from_node);
+		to_node = rb_next(to_node);
+	}
+
+	if (!from_node && !to_node)
+		ret = 0;
+
+	delete_modules(&to_modules);
+out_delete_from:
+	delete_modules(&from_modules);
+
+	return ret;
+}
+
+struct map *map_groups__first(struct map_groups *mg)
+{
+	return maps__first(&mg->maps);
+}
+
+static int do_validate_kcore_modules(const char *filename,
+				  struct map_groups *kmaps)
+{
+	struct rb_root modules = RB_ROOT;
+	struct map *old_map;
+	int err;
+
+	err = read_proc_modules(filename, &modules);
+	if (err)
+		return err;
+
+	old_map = map_groups__first(kmaps);
+	while (old_map) {
+		struct map *next = map_groups__next(old_map);
+		struct module_info *mi;
+
+		if (!__map__is_kmodule(old_map)) {
+			old_map = next;
+			continue;
+		}
+
+		/* Module must be in memory at the same address */
+		mi = find_module(old_map->dso->short_name, &modules);
+		if (!mi || mi->start != old_map->start) {
+			err = -EINVAL;
+			goto out;
+		}
+
+		old_map = next;
+	}
+out:
+	delete_modules(&modules);
+	return err;
+}
+
+/*
+ * If kallsyms is referenced by name then we look for filename in the same
+ * directory.
+ */
+static bool filename_from_kallsyms_filename(char *filename,
+					    const char *base_name,
+					    const char *kallsyms_filename)
+{
+	char *name;
+
+	strcpy(filename, kallsyms_filename);
+	name = strrchr(filename, '/');
+	if (!name)
+		return false;
+
+	name += 1;
+
+	if (!strcmp(name, "kallsyms")) {
+		strcpy(name, base_name);
+		return true;
+	}
+
+	return false;
+}
+
+static int validate_kcore_modules(const char *kallsyms_filename,
+				  struct map *map)
+{
+	struct map_groups *kmaps = map__kmaps(map);
+	char modules_filename[PATH_MAX];
+
+	if (!kmaps)
+		return -EINVAL;
+
+	if (!filename_from_kallsyms_filename(modules_filename, "modules",
+					     kallsyms_filename))
+		return -EINVAL;
+
+	if (do_validate_kcore_modules(modules_filename, kmaps))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int validate_kcore_addresses(const char *kallsyms_filename,
+				    struct map *map)
+{
+	struct kmap *kmap = map__kmap(map);
+
+	if (!kmap)
+		return -EINVAL;
+
+	if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
+		u64 start;
+
+		if (kallsyms__get_function_start(kallsyms_filename,
+						 kmap->ref_reloc_sym->name, &start))
+			return -ENOENT;
+		if (start != kmap->ref_reloc_sym->addr)
+			return -EINVAL;
+	}
+
+	return validate_kcore_modules(kallsyms_filename, map);
+}
+
+struct kcore_mapfn_data {
+	struct dso *dso;
+	struct list_head maps;
+};
+
+static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
+{
+	struct kcore_mapfn_data *md = data;
+	struct map *map;
+
+	map = map__new2(start, md->dso);
+	if (map == NULL)
+		return -ENOMEM;
+
+	map->end = map->start + len;
+	map->pgoff = pgoff;
+
+	list_add(&map->node, &md->maps);
+
+	return 0;
+}
+
+static int dso__load_kcore(struct dso *dso, struct map *map,
+			   const char *kallsyms_filename)
+{
+	struct map_groups *kmaps = map__kmaps(map);
+	struct kcore_mapfn_data md;
+	struct map *old_map, *new_map, *replacement_map = NULL;
+	struct machine *machine;
+	bool is_64_bit;
+	int err, fd;
+	char kcore_filename[PATH_MAX];
+	u64 stext;
+
+	if (!kmaps)
+		return -EINVAL;
+
+	machine = kmaps->machine;
+
+	/* This function requires that the map is the kernel map */
+	if (!__map__is_kernel(map))
+		return -EINVAL;
+
+	if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
+					     kallsyms_filename))
+		return -EINVAL;
+
+	/* Modules and kernel must be present at their original addresses */
+	if (validate_kcore_addresses(kallsyms_filename, map))
+		return -EINVAL;
+
+	md.dso = dso;
+	INIT_LIST_HEAD(&md.maps);
+
+	fd = open(kcore_filename, O_RDONLY);
+	if (fd < 0) {
+		pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
+			 kcore_filename);
+		return -EINVAL;
+	}
+
+	/* Read new maps into temporary lists */
+	err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
+			      &is_64_bit);
+	if (err)
+		goto out_err;
+	dso->is_64_bit = is_64_bit;
+
+	if (list_empty(&md.maps)) {
+		err = -EINVAL;
+		goto out_err;
+	}
+
+	/* Remove old maps */
+	old_map = map_groups__first(kmaps);
+	while (old_map) {
+		struct map *next = map_groups__next(old_map);
+
+		if (old_map != map)
+			map_groups__remove(kmaps, old_map);
+		old_map = next;
+	}
+	machine->trampolines_mapped = false;
+
+	/* Find the kernel map using the '_stext' symbol */
+	if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
+		list_for_each_entry(new_map, &md.maps, node) {
+			if (stext >= new_map->start && stext < new_map->end) {
+				replacement_map = new_map;
+				break;
+			}
+		}
+	}
+
+	if (!replacement_map)
+		replacement_map = list_entry(md.maps.next, struct map, node);
+
+	/* Add new maps */
+	while (!list_empty(&md.maps)) {
+		new_map = list_entry(md.maps.next, struct map, node);
+		list_del_init(&new_map->node);
+		if (new_map == replacement_map) {
+			map->start	= new_map->start;
+			map->end	= new_map->end;
+			map->pgoff	= new_map->pgoff;
+			map->map_ip	= new_map->map_ip;
+			map->unmap_ip	= new_map->unmap_ip;
+			/* Ensure maps are correctly ordered */
+			map__get(map);
+			map_groups__remove(kmaps, map);
+			map_groups__insert(kmaps, map);
+			map__put(map);
+		} else {
+			map_groups__insert(kmaps, new_map);
+		}
+
+		map__put(new_map);
+	}
+
+	if (machine__is(machine, "x86_64")) {
+		u64 addr;
+
+		/*
+		 * If one of the corresponding symbols is there, assume the
+		 * entry trampoline maps are too.
+		 */
+		if (!kallsyms__get_function_start(kallsyms_filename,
+						  ENTRY_TRAMPOLINE_NAME,
+						  &addr))
+			machine->trampolines_mapped = true;
+	}
+
+	/*
+	 * Set the data type and long name so that kcore can be read via
+	 * dso__data_read_addr().
+	 */
+	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+		dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
+	else
+		dso->binary_type = DSO_BINARY_TYPE__KCORE;
+	dso__set_long_name(dso, strdup(kcore_filename), true);
+
+	close(fd);
+
+	if (map->prot & PROT_EXEC)
+		pr_debug("Using %s for kernel object code\n", kcore_filename);
+	else
+		pr_debug("Using %s for kernel data\n", kcore_filename);
+
+	return 0;
+
+out_err:
+	while (!list_empty(&md.maps)) {
+		map = list_entry(md.maps.next, struct map, node);
+		list_del_init(&map->node);
+		map__put(map);
+	}
+	close(fd);
+	return -EINVAL;
+}
+
+/*
+ * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
+ * delta based on the relocation reference symbol.
+ */
+static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
+{
+	u64 addr;
+
+	if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
+		return 0;
+
+	if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
+		return -1;
+
+	*delta = addr - kmap->ref_reloc_sym->addr;
+	return 0;
+}
+
+int __dso__load_kallsyms(struct dso *dso, const char *filename,
+			 struct map *map, bool no_kcore)
+{
+	struct kmap *kmap = map__kmap(map);
+	u64 delta = 0;
+
+	if (symbol__restricted_filename(filename, "/proc/kallsyms"))
+		return -1;
+
+	if (!kmap || !kmap->kmaps)
+		return -1;
+
+	if (dso__load_all_kallsyms(dso, filename) < 0)
+		return -1;
+
+	if (kallsyms__delta(kmap, filename, &delta))
+		return -1;
+
+	symbols__fixup_end(&dso->symbols);
+	symbols__fixup_duplicate(&dso->symbols);
+
+	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
+	else
+		dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
+
+	if (!no_kcore && !dso__load_kcore(dso, map, filename))
+		return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso);
+	else
+		return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map);
+}
+
+int dso__load_kallsyms(struct dso *dso, const char *filename,
+		       struct map *map)
+{
+	return __dso__load_kallsyms(dso, filename, map, false);
+}
+
+static int dso__load_perf_map(const char *map_path, struct dso *dso)
+{
+	char *line = NULL;
+	size_t n;
+	FILE *file;
+	int nr_syms = 0;
+
+	file = fopen(map_path, "r");
+	if (file == NULL)
+		goto out_failure;
+
+	while (!feof(file)) {
+		u64 start, size;
+		struct symbol *sym;
+		int line_len, len;
+
+		line_len = getline(&line, &n, file);
+		if (line_len < 0)
+			break;
+
+		if (!line)
+			goto out_failure;
+
+		line[--line_len] = '\0'; /* \n */
+
+		len = hex2u64(line, &start);
+
+		len++;
+		if (len + 2 >= line_len)
+			continue;
+
+		len += hex2u64(line + len, &size);
+
+		len++;
+		if (len + 2 >= line_len)
+			continue;
+
+		sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
+
+		if (sym == NULL)
+			goto out_delete_line;
+
+		symbols__insert(&dso->symbols, sym);
+		nr_syms++;
+	}
+
+	free(line);
+	fclose(file);
+
+	return nr_syms;
+
+out_delete_line:
+	free(line);
+out_failure:
+	return -1;
+}
+
+static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
+					   enum dso_binary_type type)
+{
+	switch (type) {
+	case DSO_BINARY_TYPE__JAVA_JIT:
+	case DSO_BINARY_TYPE__DEBUGLINK:
+	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
+	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
+	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
+	case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
+	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
+	case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
+		return !kmod && dso->kernel == DSO_TYPE_USER;
+
+	case DSO_BINARY_TYPE__KALLSYMS:
+	case DSO_BINARY_TYPE__VMLINUX:
+	case DSO_BINARY_TYPE__KCORE:
+		return dso->kernel == DSO_TYPE_KERNEL;
+
+	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
+	case DSO_BINARY_TYPE__GUEST_VMLINUX:
+	case DSO_BINARY_TYPE__GUEST_KCORE:
+		return dso->kernel == DSO_TYPE_GUEST_KERNEL;
+
+	case DSO_BINARY_TYPE__GUEST_KMODULE:
+	case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
+	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
+	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
+		/*
+		 * kernel modules know their symtab type - it's set when
+		 * creating a module dso in machine__findnew_module_map().
+		 */
+		return kmod && dso->symtab_type == type;
+
+	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
+	case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
+		return true;
+
+	case DSO_BINARY_TYPE__NOT_FOUND:
+	default:
+		return false;
+	}
+}
+
+/* Checks for the existence of the perf-<pid>.map file in two different
+ * locations.  First, if the process is a separate mount namespace, check in
+ * that namespace using the pid of the innermost pid namespace.  If's not in a
+ * namespace, or the file can't be found there, try in the mount namespace of
+ * the tracing process using our view of its pid.
+ */
+static int dso__find_perf_map(char *filebuf, size_t bufsz,
+			      struct nsinfo **nsip)
+{
+	struct nscookie nsc;
+	struct nsinfo *nsi;
+	struct nsinfo *nnsi;
+	int rc = -1;
+
+	nsi = *nsip;
+
+	if (nsi->need_setns) {
+		snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
+		nsinfo__mountns_enter(nsi, &nsc);
+		rc = access(filebuf, R_OK);
+		nsinfo__mountns_exit(&nsc);
+		if (rc == 0)
+			return rc;
+	}
+
+	nnsi = nsinfo__copy(nsi);
+	if (nnsi) {
+		nsinfo__put(nsi);
+
+		nnsi->need_setns = false;
+		snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
+		*nsip = nnsi;
+		rc = 0;
+	}
+
+	return rc;
+}
+
+int dso__load(struct dso *dso, struct map *map)
+{
+	char *name;
+	int ret = -1;
+	u_int i;
+	struct machine *machine;
+	char *root_dir = (char *) "";
+	int ss_pos = 0;
+	struct symsrc ss_[2];
+	struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
+	bool kmod;
+	bool perfmap;
+	unsigned char build_id[BUILD_ID_SIZE];
+	struct nscookie nsc;
+	char newmapname[PATH_MAX];
+	const char *map_path = dso->long_name;
+
+	perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
+	if (perfmap) {
+		if (dso->nsinfo && (dso__find_perf_map(newmapname,
+		    sizeof(newmapname), &dso->nsinfo) == 0)) {
+			map_path = newmapname;
+		}
+	}
+
+	nsinfo__mountns_enter(dso->nsinfo, &nsc);
+	pthread_mutex_lock(&dso->lock);
+
+	/* check again under the dso->lock */
+	if (dso__loaded(dso)) {
+		ret = 1;
+		goto out;
+	}
+
+	if (map->groups && map->groups->machine)
+		machine = map->groups->machine;
+	else
+		machine = NULL;
+
+	if (dso->kernel) {
+		if (dso->kernel == DSO_TYPE_KERNEL)
+			ret = dso__load_kernel_sym(dso, map);
+		else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+			ret = dso__load_guest_kernel_sym(dso, map);
+
+		if (machine__is(machine, "x86_64"))
+			machine__map_x86_64_entry_trampolines(machine, dso);
+		goto out;
+	}
+
+	dso->adjust_symbols = 0;
+
+	if (perfmap) {
+		struct stat st;
+
+		if (lstat(map_path, &st) < 0)
+			goto out;
+
+		if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
+			pr_warning("File %s not owned by current user or root, "
+				   "ignoring it (use -f to override).\n", map_path);
+			goto out;
+		}
+
+		ret = dso__load_perf_map(map_path, dso);
+		dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
+					     DSO_BINARY_TYPE__NOT_FOUND;
+		goto out;
+	}
+
+	if (machine)
+		root_dir = machine->root_dir;
+
+	name = malloc(PATH_MAX);
+	if (!name)
+		goto out;
+
+	kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
+		dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
+		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
+		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
+
+
+	/*
+	 * Read the build id if possible. This is required for
+	 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
+	 */
+	if (!dso->has_build_id &&
+	    is_regular_file(dso->long_name)) {
+	    __symbol__join_symfs(name, PATH_MAX, dso->long_name);
+	    if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
+		dso__set_build_id(dso, build_id);
+	}
+
+	/*
+	 * Iterate over candidate debug images.
+	 * Keep track of "interesting" ones (those which have a symtab, dynsym,
+	 * and/or opd section) for processing.
+	 */
+	for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
+		struct symsrc *ss = &ss_[ss_pos];
+		bool next_slot = false;
+		bool is_reg;
+		bool nsexit;
+		int sirc = -1;
+
+		enum dso_binary_type symtab_type = binary_type_symtab[i];
+
+		nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
+		    symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
+
+		if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
+			continue;
+
+		if (dso__read_binary_type_filename(dso, symtab_type,
+						   root_dir, name, PATH_MAX))
+			continue;
+
+		if (nsexit)
+			nsinfo__mountns_exit(&nsc);
+
+		is_reg = is_regular_file(name);
+		if (is_reg)
+			sirc = symsrc__init(ss, dso, name, symtab_type);
+
+		if (nsexit)
+			nsinfo__mountns_enter(dso->nsinfo, &nsc);
+
+		if (!is_reg || sirc < 0)
+			continue;
+
+		if (!syms_ss && symsrc__has_symtab(ss)) {
+			syms_ss = ss;
+			next_slot = true;
+			if (!dso->symsrc_filename)
+				dso->symsrc_filename = strdup(name);
+		}
+
+		if (!runtime_ss && symsrc__possibly_runtime(ss)) {
+			runtime_ss = ss;
+			next_slot = true;
+		}
+
+		if (next_slot) {
+			ss_pos++;
+
+			if (syms_ss && runtime_ss)
+				break;
+		} else {
+			symsrc__destroy(ss);
+		}
+
+	}
+
+	if (!runtime_ss && !syms_ss)
+		goto out_free;
+
+	if (runtime_ss && !syms_ss) {
+		syms_ss = runtime_ss;
+	}
+
+	/* We'll have to hope for the best */
+	if (!runtime_ss && syms_ss)
+		runtime_ss = syms_ss;
+
+	if (syms_ss)
+		ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
+	else
+		ret = -1;
+
+	if (ret > 0) {
+		int nr_plt;
+
+		nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
+		if (nr_plt > 0)
+			ret += nr_plt;
+	}
+
+	for (; ss_pos > 0; ss_pos--)
+		symsrc__destroy(&ss_[ss_pos - 1]);
+out_free:
+	free(name);
+	if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
+		ret = 0;
+out:
+	dso__set_loaded(dso);
+	pthread_mutex_unlock(&dso->lock);
+	nsinfo__mountns_exit(&nsc);
+
+	return ret;
+}
+
+struct map *map_groups__find_by_name(struct map_groups *mg, const char *name)
+{
+	struct maps *maps = &mg->maps;
+	struct map *map;
+
+	down_read(&maps->lock);
+
+	for (map = maps__first(maps); map; map = map__next(map)) {
+		if (map->dso && strcmp(map->dso->short_name, name) == 0)
+			goto out_unlock;
+	}
+
+	map = NULL;
+
+out_unlock:
+	up_read(&maps->lock);
+	return map;
+}
+
+int dso__load_vmlinux(struct dso *dso, struct map *map,
+		      const char *vmlinux, bool vmlinux_allocated)
+{
+	int err = -1;
+	struct symsrc ss;
+	char symfs_vmlinux[PATH_MAX];
+	enum dso_binary_type symtab_type;
+
+	if (vmlinux[0] == '/')
+		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
+	else
+		symbol__join_symfs(symfs_vmlinux, vmlinux);
+
+	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+		symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
+	else
+		symtab_type = DSO_BINARY_TYPE__VMLINUX;
+
+	if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
+		return -1;
+
+	err = dso__load_sym(dso, map, &ss, &ss, 0);
+	symsrc__destroy(&ss);
+
+	if (err > 0) {
+		if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+			dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
+		else
+			dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
+		dso__set_long_name(dso, vmlinux, vmlinux_allocated);
+		dso__set_loaded(dso);
+		pr_debug("Using %s for symbols\n", symfs_vmlinux);
+	}
+
+	return err;
+}
+
+int dso__load_vmlinux_path(struct dso *dso, struct map *map)
+{
+	int i, err = 0;
+	char *filename = NULL;
+
+	pr_debug("Looking at the vmlinux_path (%d entries long)\n",
+		 vmlinux_path__nr_entries + 1);
+
+	for (i = 0; i < vmlinux_path__nr_entries; ++i) {
+		err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
+		if (err > 0)
+			goto out;
+	}
+
+	if (!symbol_conf.ignore_vmlinux_buildid)
+		filename = dso__build_id_filename(dso, NULL, 0, false);
+	if (filename != NULL) {
+		err = dso__load_vmlinux(dso, map, filename, true);
+		if (err > 0)
+			goto out;
+		free(filename);
+	}
+out:
+	return err;
+}
+
+static bool visible_dir_filter(const char *name, struct dirent *d)
+{
+	if (d->d_type != DT_DIR)
+		return false;
+	return lsdir_no_dot_filter(name, d);
+}
+
+static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
+{
+	char kallsyms_filename[PATH_MAX];
+	int ret = -1;
+	struct strlist *dirs;
+	struct str_node *nd;
+
+	dirs = lsdir(dir, visible_dir_filter);
+	if (!dirs)
+		return -1;
+
+	strlist__for_each_entry(nd, dirs) {
+		scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
+			  "%s/%s/kallsyms", dir, nd->s);
+		if (!validate_kcore_addresses(kallsyms_filename, map)) {
+			strlcpy(dir, kallsyms_filename, dir_sz);
+			ret = 0;
+			break;
+		}
+	}
+
+	strlist__delete(dirs);
+
+	return ret;
+}
+
+/*
+ * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
+ * since access(R_OK) only checks with real UID/GID but open() use effective
+ * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
+ */
+static bool filename__readable(const char *file)
+{
+	int fd = open(file, O_RDONLY);
+	if (fd < 0)
+		return false;
+	close(fd);
+	return true;
+}
+
+static char *dso__find_kallsyms(struct dso *dso, struct map *map)
+{
+	u8 host_build_id[BUILD_ID_SIZE];
+	char sbuild_id[SBUILD_ID_SIZE];
+	bool is_host = false;
+	char path[PATH_MAX];
+
+	if (!dso->has_build_id) {
+		/*
+		 * Last resort, if we don't have a build-id and couldn't find
+		 * any vmlinux file, try the running kernel kallsyms table.
+		 */
+		goto proc_kallsyms;
+	}
+
+	if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
+				 sizeof(host_build_id)) == 0)
+		is_host = dso__build_id_equal(dso, host_build_id);
+
+	/* Try a fast path for /proc/kallsyms if possible */
+	if (is_host) {
+		/*
+		 * Do not check the build-id cache, unless we know we cannot use
+		 * /proc/kcore or module maps don't match to /proc/kallsyms.
+		 * To check readability of /proc/kcore, do not use access(R_OK)
+		 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
+		 * can't check it.
+		 */
+		if (filename__readable("/proc/kcore") &&
+		    !validate_kcore_addresses("/proc/kallsyms", map))
+			goto proc_kallsyms;
+	}
+
+	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
+
+	/* Find kallsyms in build-id cache with kcore */
+	scnprintf(path, sizeof(path), "%s/%s/%s",
+		  buildid_dir, DSO__NAME_KCORE, sbuild_id);
+
+	if (!find_matching_kcore(map, path, sizeof(path)))
+		return strdup(path);
+
+	/* Use current /proc/kallsyms if possible */
+	if (is_host) {
+proc_kallsyms:
+		return strdup("/proc/kallsyms");
+	}
+
+	/* Finally, find a cache of kallsyms */
+	if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
+		pr_err("No kallsyms or vmlinux with build-id %s was found\n",
+		       sbuild_id);
+		return NULL;
+	}
+
+	return strdup(path);
+}
+
+static int dso__load_kernel_sym(struct dso *dso, struct map *map)
+{
+	int err;
+	const char *kallsyms_filename = NULL;
+	char *kallsyms_allocated_filename = NULL;
+	/*
+	 * Step 1: if the user specified a kallsyms or vmlinux filename, use
+	 * it and only it, reporting errors to the user if it cannot be used.
+	 *
+	 * For instance, try to analyse an ARM perf.data file _without_ a
+	 * build-id, or if the user specifies the wrong path to the right
+	 * vmlinux file, obviously we can't fallback to another vmlinux (a
+	 * x86_86 one, on the machine where analysis is being performed, say),
+	 * or worse, /proc/kallsyms.
+	 *
+	 * If the specified file _has_ a build-id and there is a build-id
+	 * section in the perf.data file, we will still do the expected
+	 * validation in dso__load_vmlinux and will bail out if they don't
+	 * match.
+	 */
+	if (symbol_conf.kallsyms_name != NULL) {
+		kallsyms_filename = symbol_conf.kallsyms_name;
+		goto do_kallsyms;
+	}
+
+	if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
+		return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
+	}
+
+	if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
+		err = dso__load_vmlinux_path(dso, map);
+		if (err > 0)
+			return err;
+	}
+
+	/* do not try local files if a symfs was given */
+	if (symbol_conf.symfs[0] != 0)
+		return -1;
+
+	kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
+	if (!kallsyms_allocated_filename)
+		return -1;
+
+	kallsyms_filename = kallsyms_allocated_filename;
+
+do_kallsyms:
+	err = dso__load_kallsyms(dso, kallsyms_filename, map);
+	if (err > 0)
+		pr_debug("Using %s for symbols\n", kallsyms_filename);
+	free(kallsyms_allocated_filename);
+
+	if (err > 0 && !dso__is_kcore(dso)) {
+		dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
+		dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
+		map__fixup_start(map);
+		map__fixup_end(map);
+	}
+
+	return err;
+}
+
+static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
+{
+	int err;
+	const char *kallsyms_filename = NULL;
+	struct machine *machine;
+	char path[PATH_MAX];
+
+	if (!map->groups) {
+		pr_debug("Guest kernel map hasn't the point to groups\n");
+		return -1;
+	}
+	machine = map->groups->machine;
+
+	if (machine__is_default_guest(machine)) {
+		/*
+		 * if the user specified a vmlinux filename, use it and only
+		 * it, reporting errors to the user if it cannot be used.
+		 * Or use file guest_kallsyms inputted by user on commandline
+		 */
+		if (symbol_conf.default_guest_vmlinux_name != NULL) {
+			err = dso__load_vmlinux(dso, map,
+						symbol_conf.default_guest_vmlinux_name,
+						false);
+			return err;
+		}
+
+		kallsyms_filename = symbol_conf.default_guest_kallsyms;
+		if (!kallsyms_filename)
+			return -1;
+	} else {
+		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
+		kallsyms_filename = path;
+	}
+
+	err = dso__load_kallsyms(dso, kallsyms_filename, map);
+	if (err > 0)
+		pr_debug("Using %s for symbols\n", kallsyms_filename);
+	if (err > 0 && !dso__is_kcore(dso)) {
+		dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
+		dso__set_long_name(dso, machine->mmap_name, false);
+		map__fixup_start(map);
+		map__fixup_end(map);
+	}
+
+	return err;
+}
+
+static void vmlinux_path__exit(void)
+{
+	while (--vmlinux_path__nr_entries >= 0)
+		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
+	vmlinux_path__nr_entries = 0;
+
+	zfree(&vmlinux_path);
+}
+
+static const char * const vmlinux_paths[] = {
+	"vmlinux",
+	"/boot/vmlinux"
+};
+
+static const char * const vmlinux_paths_upd[] = {
+	"/boot/vmlinux-%s",
+	"/usr/lib/debug/boot/vmlinux-%s",
+	"/lib/modules/%s/build/vmlinux",
+	"/usr/lib/debug/lib/modules/%s/vmlinux",
+	"/usr/lib/debug/boot/vmlinux-%s.debug"
+};
+
+static int vmlinux_path__add(const char *new_entry)
+{
+	vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
+	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+		return -1;
+	++vmlinux_path__nr_entries;
+
+	return 0;
+}
+
+static int vmlinux_path__init(struct perf_env *env)
+{
+	struct utsname uts;
+	char bf[PATH_MAX];
+	char *kernel_version;
+	unsigned int i;
+
+	vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
+			      ARRAY_SIZE(vmlinux_paths_upd)));
+	if (vmlinux_path == NULL)
+		return -1;
+
+	for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
+		if (vmlinux_path__add(vmlinux_paths[i]) < 0)
+			goto out_fail;
+
+	/* only try kernel version if no symfs was given */
+	if (symbol_conf.symfs[0] != 0)
+		return 0;
+
+	if (env) {
+		kernel_version = env->os_release;
+	} else {
+		if (uname(&uts) < 0)
+			goto out_fail;
+
+		kernel_version = uts.release;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
+		snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
+		if (vmlinux_path__add(bf) < 0)
+			goto out_fail;
+	}
+
+	return 0;
+
+out_fail:
+	vmlinux_path__exit();
+	return -1;
+}
+
+int setup_list(struct strlist **list, const char *list_str,
+		      const char *list_name)
+{
+	if (list_str == NULL)
+		return 0;
+
+	*list = strlist__new(list_str, NULL);
+	if (!*list) {
+		pr_err("problems parsing %s list\n", list_name);
+		return -1;
+	}
+
+	symbol_conf.has_filter = true;
+	return 0;
+}
+
+int setup_intlist(struct intlist **list, const char *list_str,
+		  const char *list_name)
+{
+	if (list_str == NULL)
+		return 0;
+
+	*list = intlist__new(list_str);
+	if (!*list) {
+		pr_err("problems parsing %s list\n", list_name);
+		return -1;
+	}
+	return 0;
+}
+
+static bool symbol__read_kptr_restrict(void)
+{
+	bool value = false;
+	FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
+
+	if (fp != NULL) {
+		char line[8];
+
+		if (fgets(line, sizeof(line), fp) != NULL)
+			value = ((geteuid() != 0) || (getuid() != 0)) ?
+					(atoi(line) != 0) :
+					(atoi(line) == 2);
+
+		fclose(fp);
+	}
+
+	return value;
+}
+
+int symbol__annotation_init(void)
+{
+	if (symbol_conf.init_annotation)
+		return 0;
+
+	if (symbol_conf.initialized) {
+		pr_err("Annotation needs to be init before symbol__init()\n");
+		return -1;
+	}
+
+	symbol_conf.priv_size += sizeof(struct annotation);
+	symbol_conf.init_annotation = true;
+	return 0;
+}
+
+int symbol__init(struct perf_env *env)
+{
+	const char *symfs;
+
+	if (symbol_conf.initialized)
+		return 0;
+
+	symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
+
+	symbol__elf_init();
+
+	if (symbol_conf.sort_by_name)
+		symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
+					  sizeof(struct symbol));
+
+	if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
+		return -1;
+
+	if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
+		pr_err("'.' is the only non valid --field-separator argument\n");
+		return -1;
+	}
+
+	if (setup_list(&symbol_conf.dso_list,
+		       symbol_conf.dso_list_str, "dso") < 0)
+		return -1;
+
+	if (setup_list(&symbol_conf.comm_list,
+		       symbol_conf.comm_list_str, "comm") < 0)
+		goto out_free_dso_list;
+
+	if (setup_intlist(&symbol_conf.pid_list,
+		       symbol_conf.pid_list_str, "pid") < 0)
+		goto out_free_comm_list;
+
+	if (setup_intlist(&symbol_conf.tid_list,
+		       symbol_conf.tid_list_str, "tid") < 0)
+		goto out_free_pid_list;
+
+	if (setup_list(&symbol_conf.sym_list,
+		       symbol_conf.sym_list_str, "symbol") < 0)
+		goto out_free_tid_list;
+
+	if (setup_list(&symbol_conf.bt_stop_list,
+		       symbol_conf.bt_stop_list_str, "symbol") < 0)
+		goto out_free_sym_list;
+
+	/*
+	 * A path to symbols of "/" is identical to ""
+	 * reset here for simplicity.
+	 */
+	symfs = realpath(symbol_conf.symfs, NULL);
+	if (symfs == NULL)
+		symfs = symbol_conf.symfs;
+	if (strcmp(symfs, "/") == 0)
+		symbol_conf.symfs = "";
+	if (symfs != symbol_conf.symfs)
+		free((void *)symfs);
+
+	symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
+
+	symbol_conf.initialized = true;
+	return 0;
+
+out_free_sym_list:
+	strlist__delete(symbol_conf.sym_list);
+out_free_tid_list:
+	intlist__delete(symbol_conf.tid_list);
+out_free_pid_list:
+	intlist__delete(symbol_conf.pid_list);
+out_free_comm_list:
+	strlist__delete(symbol_conf.comm_list);
+out_free_dso_list:
+	strlist__delete(symbol_conf.dso_list);
+	return -1;
+}
+
+void symbol__exit(void)
+{
+	if (!symbol_conf.initialized)
+		return;
+	strlist__delete(symbol_conf.bt_stop_list);
+	strlist__delete(symbol_conf.sym_list);
+	strlist__delete(symbol_conf.dso_list);
+	strlist__delete(symbol_conf.comm_list);
+	intlist__delete(symbol_conf.tid_list);
+	intlist__delete(symbol_conf.pid_list);
+	vmlinux_path__exit();
+	symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
+	symbol_conf.bt_stop_list = NULL;
+	symbol_conf.initialized = false;
+}
+
+int symbol__config_symfs(const struct option *opt __maybe_unused,
+			 const char *dir, int unset __maybe_unused)
+{
+	char *bf = NULL;
+	int ret;
+
+	symbol_conf.symfs = strdup(dir);
+	if (symbol_conf.symfs == NULL)
+		return -ENOMEM;
+
+	/* skip the locally configured cache if a symfs is given, and
+	 * config buildid dir to symfs/.debug
+	 */
+	ret = asprintf(&bf, "%s/%s", dir, ".debug");
+	if (ret < 0)
+		return -ENOMEM;
+
+	set_buildid_dir(bf);
+
+	free(bf);
+	return 0;
+}
+
+struct mem_info *mem_info__get(struct mem_info *mi)
+{
+	if (mi)
+		refcount_inc(&mi->refcnt);
+	return mi;
+}
+
+void mem_info__put(struct mem_info *mi)
+{
+	if (mi && refcount_dec_and_test(&mi->refcnt))
+		free(mi);
+}
+
+struct mem_info *mem_info__new(void)
+{
+	struct mem_info *mi = zalloc(sizeof(*mi));
+
+	if (mi)
+		refcount_set(&mi->refcnt, 1);
+	return mi;
+}